the unix listener closes the connection unexpectedly with: echo foo | nc -U /tmp/mysock

I tried the following example on the AnyIO documentation:

from anyio import create_unix_listener, run


async def handle(client):
    async with client:
        name = await client.receive(4) # I changed the value
        await client.send(b'Hello, %s\n' % name)


async def main():
    listener = await create_unix_listener('/tmp/mysock')
    await listener.serve(handle)

run(main)

When sending a string with echo foo | nc -U /tmp/mysock the answer is never printed. However running nc -U /tmp/mysock interactively it is working.

Also this callback works as expected with asyncio.start_unix_server():

    async def _handle_request(self, reader, writer):
        line = await reader.readline()
        writer.write(line)
        await writer.drain()
        writer.write_eof()
        writer.close()

[agronholm]

Ok, I figured it out. There’s something I didn’t know – you have to return True from a Protocol’s eof_received() method, or else the transport will be shut down.

[agronholm]

Fixed via 3b4c6495, released in v2.2.0.